<template>
  <div id="root">
    <div class="todo-container">
      <div class="todo-wrap">
        <TodoHeader :addTodo="addTodo"></TodoHeader>
        <TodoList :todos="todos" :checkTodo="checkTodo" :deleteTodo="deleteTodo"></TodoList>
        <TodoFooter :todos="todos" :isDeleteAll="isDeleteAll" :ClearAllTodo="ClearAllTodo"></TodoFooter>
      </div>
    </div>
  </div>
</template>

<script>
import TodoFooter from "./components/TodoFooter.vue";
import TodoList from "./components/TodoList.vue";
import TodoHeader from "./components/TodoHeader.vue";
export default {
  name: 'App',
  components: {
    TodoHeader,
    TodoList,
    TodoFooter
  },
  data() {
    return {
      //刚开始时去除todos 注意：候选项 取出localStorage 是一个字符串
      todos:  JSON.parse(localStorage.getItem('todos')) || []
    }
  },
  methods:{
    addTodo(TodoObj) {
      //传入的TodoObj给todos数组加上 再将数组给TodoList传进去
      this.todos.unshift(TodoObj);
      console.log(TodoObj)
    },
    checkTodo(id) {
      this.todos.forEach(item => {
        if (item.id === id) {
          item.done = !item.done;
        }
      })
    },
    deleteTodo(id) {
      //删除一个todo 传入参数id
      this.todos = this.todos.filter(item => item.id !== id);
    },
    isDeleteAll(flag) {
      if(!flag) {
        this.todos.forEach(item => item.done = false);
      } else {
        this.todos.forEach(item => item.done = true);
      }
    },
    ClearAllTodo() {
      this.todos = this.todos.filter(todo => {
        return !todo.done;
      })
    }
  },

  //完善刷新问题丢失的问题
  watch:{
    //监视todos数组 有改变往localStorage中存储(要开启深度监视)
    todos:{
      deep:true,
      handler(value) {
        localStorage.setItem('todos',JSON.stringify(value));
      }
    }
  }
}
</script>

<style>
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}

.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}

</style>
